Just had to post this and tell everyone. My ex-wife calls me and tells me she has no brakes in her car. The car needed front disks very badly. I remove the tire on the passenger side and I couldn't believe my eyes. The rotor was worn down to the point that there was no more face on it. It was down to the center area with the fins/ribs (inside rotors). The outer part of the rotor (where the pads press against) had finally broke free from the section that goes over the wheel studs, so when she hit the brakes, the outer part would just get pinched and held but the wheel would still spin since it was broken off that part. I've NEVER seen it this bad.
Luckily she hadn't burned up the calipers (I don't know how), but got the pads put on and everything is ok now.
Just had to share this. I wish I had a camera so I could post a picture of it here. It was the craziest thing I've ever seen as far as brakes go.